| 不同蛋白水平对犊牛生长、营养代谢及氨基酸消化率的影响 |
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| 引用本文： | 李辉,刁其玉,张乃锋.不同蛋白水平对犊牛生长、营养代谢及氨基酸消化率的影响[J].畜牧兽医学报,2008,39(11). |
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| 作者姓名： | 李辉 刁其玉 张乃锋 |
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| 作者单位： | 中国农业科学院饲料研究所,北京,100081 |
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| 摘 要： | 研究不同蛋白水平代乳品对哺乳期犊牛生长发育、常规营养物质消化代谢及氨基酸消化的影响。选15头新生健康荷斯坦犊牛分为3组，分别饲喂蛋白含量为18％、22％及26％的代乳品，记为LP、MP及HP组。结果发现，MP组犊牛体增重高于其余2组（P〈O．05），3组犊牛的平均日增重分别为598．10、829．52及628．57g／d。3组犊牛对日粮DM、EE及Ash的表观消化率无显著差异（P〉0．05），而MP组犊牛对日粮CP的消化率较高（P〈0．05）。摄入N和粪N随日粮蛋白含量增加而增多（P〈0．05），而尿N不受日粮蛋白水平的影响（P〉0．05）。MP组犊牛对钙、磷的存留量和存留率均高于其余2组（P〈0．05）。3种代乳品的总氨基酸消化率分别为82．73％、83．41％及79．45％，蛋白水平对3组犊牛氨基酸（除丙氨酸外）消化率的影响不显著（P〉0．05）。结果表明，蛋白含量为22％的代乳品对犊牛的增重效果和营养物质利用率优于其余2组。
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| 关 键 词： | 犊牛 蛋白质 氨基酸 代乳品 消化率 |
Effect of Different Protein Levels on the Growth,Nutrient Utilization and Amino Acids Digestibility of Dairy Calves |
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| LI Hui,DIAO Qi-yu,ZHANG Nai-feng.Effect of Different Protein Levels on the Growth,Nutrient Utilization and Amino Acids Digestibility of Dairy Calves[J].Acta Veterinaria et Zootechnica Sinica,2008,39(11). |
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| Authors: | LI Hui DIAO Qi-yu ZHANG Nai-feng |
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| Institution: | LI Hui,DIAO Qi-yu,ZHANG Nai-feng(Feed Research Institute,Chinese Academy of Agricultural Sciences,Beijing 100081,China) |
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| Abstract: | This study was designed to examine the effects of different dietary protein levels on growth performance,nutrients utilization,and amino acid(AA) digestibility of early-weaning dairy calves.Fifteen healthy new born calves were randomly allotted into three experimental groups and fed three kinds of milk replacers with different protein levels(18%,22% and 26%) respectively,labeled as LP,MP and HP group.The results showed that the body weight(BW) gain of MP group was higher than that of other groups(P<0.05),th... |
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| Keywords: | calves protein amino acid milk replacer digestibility |
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